<!DOCTYPE html>
<html>

<head>
	<meta charset="UTF-8">
	<title>Origami Editor 3D User Guide</title>
</head>

<body style="margin-left:100px; margin-right:100px; font-family:sans-serif; font-size:16px; text-align:justify; text-justify:inter-word;">

<table style="width:100%" bgcolor="#FFFF00">
	<tr>
		<td width="33%" align="left"><b><a href="neusismode.html" style="color:black">&lt;&lt; PREV</a></b></td>
		<td width="33%" align="center"><b><a href="../index.html" style="color:black">INDEX</a></b></td>
		<td width="33%" align="right"><b><a href="anglebisector.html" style="color:black">NEXT &gt;&gt;</a></b></td>
	</tr>
</table>

<h1>Plane through 3 points</h1>

<p>This tool is an alternative to the <a href="../basicediting/ruler.html">Ruler</a>. It draws the folding lines along a plane that goes through three points of the origami selected by the user in the <a href="../basicediting/creasepattern.html">Crease Pattern</a>. After these 3 points are selected, the red lines marking the folding lines will appear on the Crease Pattern, and you can right click on the <a href="../basicediting/3dview.html">3D View</a> to bring out the usual popup menu.
<p>If the points you selected are on the same line, the program will show an error message because it is not possible to unambiguously construct a plane that coincides with 3 points on a line.
<p>'Plane through 3 points' can be enabled by clicking on the <img src="planethrough/01.png"/> button.
<p>The <a href="../basicediting/snap.html">Snap</a> option works with this tool as well, but it will not display the small black squares seen on the 3D View.

<h2>Exercise</h2>
<ol>
<li>Start with a water bomb base by going to <b>File &gt; New &gt; Bases &gt; Water bomb base</b>. Of course, we could also fold this base from scratch, but that would be an unnecessary nuisance.</li>
<li>Align the Ruler to the center line and select <b>Rotate</b>.
<center><img src="planethrough/02.png" width="60%" ></center></li>
<li>Set the angle to 45&deg; (it doesn't have to be exact).
<center><img src="planethrough/03.png" width="60%" ></center></li>
<li>Click on one of the bottom triangles in the Crease Pattern:
<center><img src="planethrough/04.png" width="60%" ></center></li>
<li>Click the <img src="planethrough/01.png"/> button and left click on the paper's center point, bottom left corner and bottom right corner in the Crease Pattern:
<center><img src="planethrough/05.png" width="60%" ></center></li>
<li>Click <b>Reflect</b> in the popup menu.
<center><img src="planethrough/06.png" width="60%" ></center></li>
<li>The lower part of the paper has been reflected over the plane that goes through the points you selected in Step 5. You have folded a hat.
<center><img src="planethrough/07.png" width="60%" ></center></li>
</ol>

<table style="width:100%" bgcolor="#FFFF00">
	<tr>
		<td width="33%" align="left"><b><a href="neusismode.html" style="color:black">&lt;&lt; PREV</a></b></td>
		<td width="33%" align="center"><b><a href="../index.html" style="color:black">INDEX</a></b></td>
		<td width="33%" align="right"><b><a href="anglebisector.html" style="color:black">NEXT &gt;&gt;</a></b></td>
	</tr>
</table>

</body>
</html>

